#
# # 遍历字符串
# for c in "abcd":
#     print(c)
#
# # 遍历列表
# for c in [10,20,30]:
#     print(c)
# # 遍历元组
# for c in (10,20,30):
#     print(c)
# # 遍历集合
# for c in {10, 20, 30}:
#     print(c)
# # 遍历字典
# a={'name':"list",'age':20}
# for i in a:
#     print(i,":",a[i])
# #嵌套结构
# a=[('a','aaaa'),('b','bbbb'),('c','cccc')]
# for v1,v2 in a:
#     print(v1,"=>",v2)
#
# range()使用
# 输出0-9
# for i in range(10):
#     print(i,end=" ")
# print("")
# # 输出2-6
# for i in range(2,7):
#     print(i,end=" ")
# print("")
# # 输出0-50,递增5
# for i in range(0,51,5):
#     print(i,end=" ")
# print("")
# # 10~1
# for i in range(10,0,-1):
#     print(i,end=" ")
# print("")
# a=["aaa","bbb","ccc"]
# for i in range(len(a)):
#     print(i,"=>",a[i])
#
# # i=1
# # while i<=10:
# #     print(i)
# #     i+=1
#
#
# for i,n in enumerate([10,20,30]):
#     print(i,n)
#
# for i in range(9,1):
#     for j in range(1,i-1):
#         print("{}*{}={:<2}".format(j,i,j*i),end=" ")
#     print("")

for i in range(-10,-100,-30):
    print(i)